more socket cleanup to allow using wxSocket from both wxBase and wxCore (replaces patch 1756260)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50831 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/apptbase.h

@@ -48,6 +48,13 @@ public:
     // ----------------
 
     // TODO
+
+#if wxUSE_SOCKETS
+    // returns the select()-based socket manager for console applications which
+    // is also used by some ports (wxX11, wxDFB) in the GUI build (hence it is
+    // here and not in wxConsoleAppTraits)
+    virtual GSocketManager *GetSocketManager();
+#endif
 };
 
 #endif // _WX_UNIX_APPTBASE_H_